1 /* 2 * drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC 3 * hardware monitoring features. 4 * 5 * Copyright (C) 2009 Wolfson Microelectronics plc 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License v2 as published by the 9 * Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/err.h> 24 #include <linux/platform_device.h> 25 #include <linux/hwmon.h> 26 #include <linux/hwmon-sysfs.h> 27 28 #include <linux/mfd/wm8350/core.h> 29 #include <linux/mfd/wm8350/comparator.h> 30 31 static ssize_t show_name(struct device *dev, 32 struct device_attribute *attr, char *buf) 33 { 34 return sprintf(buf, "wm8350\n"); 35 } 36 37 static const char * const input_names[] = { 38 [WM8350_AUXADC_USB] = "USB", 39 [WM8350_AUXADC_LINE] = "Line", 40 [WM8350_AUXADC_BATT] = "Battery", 41 }; 42 43 44 static ssize_t show_voltage(struct device *dev, 45 struct device_attribute *attr, char *buf) 46 { 47 struct wm8350 *wm8350 = dev_get_drvdata(dev); 48 int channel = to_sensor_dev_attr(attr)->index; 49 int val; 50 51 val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF; 52 val = DIV_ROUND_CLOSEST(val, 1000); 53 54 return sprintf(buf, "%d\n", val); 55 } 56 57 static ssize_t show_label(struct device *dev, 58 struct device_attribute *attr, char *buf) 59 { 60 int channel = to_sensor_dev_attr(attr)->index; 61 62 return sprintf(buf, "%s\n", input_names[channel]); 63 } 64 65 #define WM8350_NAMED_VOLTAGE(id, name) \ 66 static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\ 67 NULL, name); \ 68 static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \ 69 NULL, name) 70 71 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 72 73 WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB); 74 WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT); 75 WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE); 76 77 static struct attribute *wm8350_attributes[] = { 78 &dev_attr_name.attr, 79 80 &sensor_dev_attr_in0_input.dev_attr.attr, 81 &sensor_dev_attr_in0_label.dev_attr.attr, 82 &sensor_dev_attr_in1_input.dev_attr.attr, 83 &sensor_dev_attr_in1_label.dev_attr.attr, 84 &sensor_dev_attr_in2_input.dev_attr.attr, 85 &sensor_dev_attr_in2_label.dev_attr.attr, 86 87 NULL, 88 }; 89 90 static const struct attribute_group wm8350_attr_group = { 91 .attrs = wm8350_attributes, 92 }; 93 94 static int wm8350_hwmon_probe(struct platform_device *pdev) 95 { 96 struct wm8350 *wm8350 = platform_get_drvdata(pdev); 97 int ret; 98 99 ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group); 100 if (ret) 101 goto err; 102 103 wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev); 104 if (IS_ERR(wm8350->hwmon.classdev)) { 105 ret = PTR_ERR(wm8350->hwmon.classdev); 106 goto err_group; 107 } 108 109 return 0; 110 111 err_group: 112 sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 113 err: 114 return ret; 115 } 116 117 static int wm8350_hwmon_remove(struct platform_device *pdev) 118 { 119 struct wm8350 *wm8350 = platform_get_drvdata(pdev); 120 121 hwmon_device_unregister(wm8350->hwmon.classdev); 122 sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group); 123 124 return 0; 125 } 126 127 static struct platform_driver wm8350_hwmon_driver = { 128 .probe = wm8350_hwmon_probe, 129 .remove = wm8350_hwmon_remove, 130 .driver = { 131 .name = "wm8350-hwmon", 132 .owner = THIS_MODULE, 133 }, 134 }; 135 136 module_platform_driver(wm8350_hwmon_driver); 137 138 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 139 MODULE_DESCRIPTION("WM8350 Hardware Monitoring"); 140 MODULE_LICENSE("GPL"); 141 MODULE_ALIAS("platform:wm8350-hwmon"); 142